<mdl-form-field>
  <mdl-checkbox [(ngModel)]="isChecked"
               [indeterminate]="isIndeterminate"
               (change)="handleChange()"></mdl-checkbox>
  <label mdl-checkbox-label [id]="labelId">The checkbox is {{status}}</label>
</mdl-form-field>
<div style="padding-top: 12px;">
  <button type="button" (click)="isIndeterminate = true">Make Indeterminate</button>
</div>
<p>{{changeEventCount}} change events so far</p>
